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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: moominpapa on April 18, 2006, 07:41:03 PM

Title: a1200 max ram?
Post by: moominpapa on April 18, 2006, 07:41:03 PM

Hi,
I have purchased an 8mb ram expansion card with an fpu to go into my standard amiga 1200.
Question 1.  Will this put the amiga upto 10 or 8 mb?

Question 2.  Is this setup enough for installing and running os3.5, and would i need new roms (currently 3.1 or 3.0, most likely 3.0)

Thanks

Title: Re: a1200 max ram?
Post by: amiga1260 on April 18, 2006, 07:50:19 PM

Q1: You get a total of 10 MB of RAM. 8 MB of FAST RAM and 2 MB of Chipmem.

Fast RAM will be used only by the CPU and Chipmem is used by the Chipset and CPU. Chipmem gives the chipset piority above the CPU. That's why your Amiga is very slow.

Q2: You can run OS 3.5 with kickstart 3.1. I also have a memory card with 4 MB of RAM. It runs nicely on your setup. If you like, you could even run OS 3.9 on your setup. It needs 6 MB of fast RAM to run. I tried it on my setup, but I got an out of memory with the backdrop.

 

Title: Re: a1200 max ram?
Post by: adolescent on April 18, 2006, 07:52:06 PM

You'll have 10MB RAM total.  2M Chip, and 8M Fast.  To run OS3.5 you need Kickstart 3.1 ROMs.

Title: Re: a1200 max ram?
Post by: Flashlab on April 18, 2006, 07:53:23 PM

You already have the answer in your other thread:

http://www.amiga.org/forums/showthread.php?t=21836

Anyway, here are the full system requirements for 3.5:

http://www.haage-partner.de/com/products/aos35/aos35-e.htm#requirements

Title: Re: a1200 max ram?
Post by: amigakit on April 18, 2006, 07:54:53 PM

This will give you 8Mb Fast Memory and 2MB Chip Memory

AmigaOS 3.5 (http://amigakit.leamancomputing.com/catalog/product_info.php?products_id=190) and AmigaOS 3.9 (http://amigakit.leamancomputing.com/catalog/product_info.php?products_id=153) need official Amiga Kickstart 3.1 ROM (http://amigakit.leamancomputing.com/catalog/product_info.php?products_id=62)s for the A1200.

Title: Re: a1200 max ram?
Post by: moominpapa on April 18, 2006, 07:57:09 PM

Quote

Flashlab wrote:
You already have the answer in your other thread:

http://www.amiga.org/forums/showthread.php?t=21836

Anyway, here are the full system requirements for 3.5:

http://www.haage-partner.de/com/products/aos35/aos35-e.htm#requirements

I just wanted to clarify the question i asked, and also ask a new one.

The reason i asked this question is i thought the cpu could only address 8mb, but i see now it can address 16.  Is it possible to expand to 16 with an accelerator card?

Title: Re: a1200 max ram?
Post by: CLS2086 on April 18, 2006, 08:08:01 PM

Hi,
yes with an accelerator card you can have 256mb of FASTRam.
But if you only a ramcard, you could only have 8mb of FastRam due to the 24 bits bus of the 020EC (limited at 10 mb of ram : 8 mb Fast + 2mb chip)

Title: Re: a1200 max ram?
Post by: amigakit on April 18, 2006, 08:23:31 PM

Due to the 24-bit design / 68EC020 CPU, the stock A1200 has a limitation of 8MB (a little bit more when overwriting other address space)

When you fit a 32-bit accelerator such as a Blizzard 1230 or 1260 you can add 256MB if you had a SCSI Kit!  The BlizzardPPC can take 256MB as standard.

Title: Re: a1200 max ram?
Post by: Doobrey on April 18, 2006, 08:55:59 PM

Quote

moominpapa wrote:
The reason i asked this question is i thought the cpu could only address 8mb, but i see now it can address 16.

The 68EC020 in the A1200 can address 16mb, but 8mb of that address space is reserved for things like chip mem, Kickstart ROMs, chipset etc. That only leaves room for 8mb of fast mem (or only 4mb if you still want to use the PCMCIA slot) unless you add an accelerator card with a CPU that can address more.

Title: Re: a1200 max ram?
Post by: moominpapa on April 18, 2006, 10:09:34 PM

I actually meant to ask, is it possible to expand to 16 WITHOUT and accelerator card, sorry for sounding thick.

Thanks for the replies though, they have answered my query.

Title: Re: a1200 max ram?
Post by: icbrkr on April 19, 2006, 01:22:01 AM

Nope.. without an accelerator, you're stuck at 10MB (2+8) total.